Steam-boiler.



No. 643,946. Patented Feb. 20, I900.

m. A. COO-KE.

STEAM BOILER.

(Application filed. June 21, 1899..)

(No Model.)

v WITNESSES: nvv [won fk fig ,fldww By ATTORNEYS.

m: Noam; Pzrzasna. PHDTOLITHQ. wAsu'muTon. n. c.

UNITED STAT S PATENT OFFICE.

MAURICE ALAXANDER COOKE, OF NASHVILLE, TENNESSEE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 643,946, dated February 20, 1900.

Application filed June 21, 1899.

To all whom. it may concern;

Be it known that I, MAURICE ALAXANDER COOKE, of Nashville, in the county of Davidson and State of Tennessee, have invented a new and Improved Steam-Boiler, of which the following is a full, clear, and exact description.

My invention relates to an improvement in steam and hot-water boilers of that kind which is widely used for heating purposes, although my boiler may be used for power purposes if sufliciently strengthened.

My invention comprises the novel features of construction hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional elevation taken through the boiler and the casing. Fig. 2 is a cross-section of the boiler, and Fig. 3 is a longitudinal sect-ion of one of the tubes of the boiler.

My invention is particularly designed for use as a boiler for heating puposes, although if built of sufficient strength it may be used for power purposes.

The body of the boiler consists of two shells B and D, the latter being the smaller and being placed within the shell B. These two shells are closed at their upper ends, and at their lower ends are joined to form an annular water-space O. From the upper end of the inner shell, which forms the fire-box and combustion-chamber, depends a cylinder or large tube E, which is closed at its lower end and has a series of radial tubes F projecting therefrom, said tubes being closed at their outer ends and having a central longitudinal partition f extending from their inner open ends to near their outer ends, which construction resembles somewhat the ordinary porcupine boiler. The partitions f within the tubes cause a circulation through said tubes, which makes them more efficient than the tubes of the ordinary porcupine boiler. The water in these tubes will flow from the inner end to the outer beneath the partition and then return to the central cylinder on the upper side of the partition.

To the lower end of the cylinder E is con- Serial No. 721,350. (No model.)

nected a pipe G, which extends horizontally through the two shells and outside of the boiler-setting A. This boiler-setting consists of a brick wall or iron jacket surrounding the outer shell at a slight distance, so as to form a flue between the boiler and the setting. The annular water-space 0 between the two shells has a pipe H connected with its lower end and extending through the boiler-setting. The two pipes G and H are to be connected with any suitable heating apparatus. The circulation of water in the boiler is downward through the annular space 0, out through the pipe H, then back through pipe G, and then into the lower end of the cylinder E. The water will then rise through this tube, passing at the same time through the tubes F, connected therewith.

A short piece of pipe or a wrought-iron frame of the proper size in the shape of a thimble M connects the two shells B and D near the upper end of the combustion-chamber. The gases of combustion pass through the opening thus formed into the space between the shells and the setting and after passing about the shells pass out through the smoke-flue N. The wall A,formin g the boilersetting, also has an opening M, closed by a suitable door, by which access may be had to this flue.

The furn ace-door and the passage by which the fuel is introduced to the grate is shown at L. The grate I shown in connection with my boiler is a rocking grate, each bar thereof having a depending arm 1, the arms being all connected to a rod J, connected with alever K, the latter being located outside the boiler-setting, where it may be operated to rock the grate.

This form of boiler, while being cheap in construction, is not liable to leakage due to expansion and contraction of its parts, and it is also cheap of manufacture and very efficient in its operation and burns the soot and accumulations from soft coal, the porcupine tubes catching all the soot, and when the fire is burning the flame is continually passing through these tubes, thereby drawing the moisture from the soot and burning the latter, so that the porcupine tubes or boiler never has to be scraped or cleaned after the use of any kind of coal.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A steam-boiler, comprising an inner and outer shell arranged one within the other and joined at their lower ends to form an annular water-space, each shell being provided with a closed top, a central tube depending from the top of the inner shell and terminating short of the lower water-space between the shells, the said tube having a closed lower end and an open upper end, and provided with radial tubes closed at their outer ends and having horizontal partitions arranged therein, a return pipe leading from the bottom of the tube and extending outside of the shells, and an outgoing pipeleading from the annular space between the shells, substantially as described.

2. Asteam-boiler comprising two shel1s,one inside of the other, and joined at their lower ends to form an annular boiler-space between them, a setting or wall surrounding the outer shell at a slight distance therefrom and thus forming a flue, a tube or thimble extending through both shells near the top of the inner one, and connecting the fire-box and the outer flue, a smoke-flue leading from the outer flue at the side opposite to said connecting-flue, a cylinder depending from the top of the firebox and having radiating pipes connected thereto and closed at their outer ends, and circulating-pipes leading from the lower end of the depending cylinder with the annular space between the two shells, substantially as described.

3. A steam-boiler,c0mprising a setting having a smoke-flue, an inner and outer shell joined at the lower ends to form an annular water-space, the shells being arranged in the setting to form an annular flue, and connected near their upper ends by a thimble forming an opening from which the products 'of combustion pass to said flue, a tube depending from the top of the inner shell, said tube terminating short of the lower ends of the shells and provided with radial tubes having closed outer ends, a grate in the setting at the lower ends of the shells, a return-pipe leading from the closed lower end of the tube out through the setting, and an outgoing pipe leading from the annular space between the shells out through the setting, substantially as described.

4. A steam-boiler, comprisingasettinghaving a smoke-flue, an inner and outer shell joined at their lower ends to form an annular water-space and arranged in the setting to form an annular flue, the shells being connected on the side opposite the smoke-pipe of the setting by a thimble forming an opening through which the products of combustion pass to said flue, a central tube having an open upper end and a closed lower end, depending from the top of the inner shell, said tube terminating short of the lower ends of the shells and provided with radial tubes closed at their outer ends and provided with horizontal partitions, a grate in the setting, a return-pipe leading from the closed lower end of the central tube out through the setting, and an outgoing pipe leading from the annular water-space between the shells out through the setting, substantially as herein shown and described.

MAURICE ALAXANDER COOKE.

Witnesses:

CHAS. O. WILD, R. W. WALLER. 

